of a gaseous hydrocarbon was exploded with excess . After cooling, the contraction in volume was . O — Mole Concept and Some Basic Concepts of Chemistry Chemistry Question
Question
$10 \text{ mL}$ of a gaseous hydrocarbon $C_xH_y$ was exploded with excess $O_2$. After cooling, the contraction in volume was $25 \text{ mL}$. On treatment with $KOH$, there was a further contraction of $20 \text{ mL}$. Find the value of $y$.
Answer: 6
💡 Solution & Explanation
$\text{Vol } CO_2 = 20 \Rightarrow x = 20/10 = 2$. <br>$\text{Contraction} = V_{initial} - V_{final} = 10 + (x+y/4)10 - (100 - (\text{reacted } O_2) + 20)$. <br>Formula: $\text{Contraction} = V_{HC}(1 + y/4)$. <br>$25 = 10(1 + y/4) \Rightarrow 2.5 = 1 + y/4 \Rightarrow y/4 = 1.5 \Rightarrow y = 6$.
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